| Picture | Plant Name | Scientific Name | Plant Description |
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| Agave Leaved Sea Holly | Eryngium agavifolium | Clump-forming, evergreen perennial. Bright green, lance-shaped leaves have toothed margins and resemble an agave. White, thistle-like flower heads form in summer. May not be entirely winter hardy and will struggle through Utah winters. |
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| Alaska Shasta Daisy | Leucanthemum x superbum 'Alaska' | Clump-forming perennial. Produces large, single, pure white flowers up to 3" in diameter with yellow centers in late-summer to autumn. Leaves are dark green, glossy, lance-shapeds are toothed. Plant in well-drained soils. Tolerates some drought but prefers moderate amounts of water. |
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| Alder-Leaf Mountain Mahogany | Cercocarpus montanus | A semi-evergreen shrub native to Western North America. Small yellow flowers turn to more conspicuous tufted seeds. The leaves are broader than other mountain mahogany species with crowded parallel veins. Very drought tolerant and will drop its leaves in extreme drought situations and then fully recover. Works great as a massed planting. |
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| Alder-Leaved Serviceberry | Amelanchier alnifolia | Suckering, deciduous shrub native to the western United States. Rounded, dark-green leaves are slightly toothed at the tips and turn yellow to red in the fall. Clusters of pure white flowers, up to 1" in diameter, bloom in late-spring followed by purple-black berries. Berries are said to resemble blueberries in both look and taste and are often used in jellies and jams. Tolerant of alkaline soils. |
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| Alexandrina Magnolia | Magnolia x soulangeana 'Alexandrina' | Small deciduous flowering hybrid tree. Large fragrant flowers (3-6 in. across) appear in early spring before the leaves. Flowers are white on the inside and rosy to dark-pink on the outside. Dark green obovate leaves turn yellow in the fall. Does not tolerate soil extremes. Prefers fertile soils with moderate amounts of water. Plant in a place that will showcase the spring blooms. |
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| Alkali Sacaton | Sporobolus airoides | Clump-forming perennial grass with lightly sharp-edged, gray-green leaves 12-24" long. In mid summer, produces cloud-like flower pannicles of golden, pinkish bronze 24-36" long above the foliage. Extremely drought tolerant. Zones 4-9. |
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| Allegheny Serviceberry | Amelanchier laevis | Small tree or large deciduous shrub. Usually grown with multiple stems. Pure-white flowers grow in clusters in early-spring. Finely serrated, smooth leaves are purple when new then change to mid-green and then to orange-red in the fall. Prefers moist, well-drained soils but will tolerate a wide variety of conditions. Zones 4-9. |
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| Allgold Broom | Cytisus x praecox 'Allgold' | Hybrid mounding deciduous shrub. This variety of broom is slightly taller than the species. Dark green stems appear broom-like, hence the name. Bright yellow flowers adorn this shrub throughout the spring. Adapts readily to hot and dry conditions but with stunted growth. Zones 5-9. |
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| Allwood Pink | Dianthus Allwoodii Alpinus Group | Mat-forming perennial producing single, scentless, bright rose-red to pink flowers with toothed petals and darker centers. Has a grassy blue-gray foliage. Profuse bloom time through mid-summer. Prefers full sun and somewhat dry soil. Common name refers to the toothed edges of the petals which look as though they were cut with pinking shears. Zones 4-8. |
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| Alpine Baby's Breath | Gypsophila petraea | An alpine perennial with masses of small white flowers on upright stems. Abundant dark green clumps of narrow foliage are a nice addition to any rock garden. Availability of this variety is not as great as other species. Needs excellent drainage and consistent watering. Zones 3-7. |
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